Why does the Ramadhan Timetable vary so much

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Why do we have so many Ramadhan timetable across different mosques. And surely, the times shoudl be set in stone. Could we not simply use the Met Office to give us the times? Or would this be too easy for us??

The issue is that many calendars end sehri when the sun is 18 degrees below the horizon... only that the sun does not go below that in some parts of the world in some parts of the year.

Here, some timetables simply start fajr time/end sehri at the half way point between sunset and sunrise thinking that as a decent way of following "the rules". (I dont agree but that is a different matter.)

With such timetables, the sehri ends time will be stationary til when the sun starts going below 18 degrees again and they can use their methods of calculation.

(because Ocean is a lot further to the north, the day when that happens is later than it does for here, where it has happened a week or so ago.)

On the other hand there is another calculation method/timetable that puts sehri ends at around quarter to 4, but since fasting is now about cheating, if you consider that timetable "cheating", you are unlikely to follow it (I am not sure what the calculation method for that is, but logically the timing seems mroe correct to me).

The issue is that many calendars end sehri when the sun is 18 degrees below the horizon... only that the sun does not go below that in some parts of the world in some parts of the year.

Here, some timetables simply start fajr time/end sehri at the half way point between sunset and sunrise thinking that as a decent way of following "the rules". (I dont agree but that is a different matter.)

With such timetables, the sehri ends time will be stationary til when the sun starts going below 18 degrees again and they can use their methods of calculation.

(because Ocean is a lot further to the north, the day when that happens is later than it does for here, where it has happened a week or so ago.)

On the other hand there is another calculation method/timetable that puts sehri ends at around quarter to 4, but since fasting is now about cheating, if you consider that timetable "cheating", you are unlikely to follow it (I am not sure what the calculation method for that is, but logically the timing seems mroe correct to me).

yeh but the total amount of time that it is dark every night is longer than the previous night.
The days dont stay the same length as each other unless you live on the equator.